Note 6 - Offsetting Assets and Liabilities - Offsetting Assets (Details) - Assets [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Gross amount, recognized	$ 29,315	$ 40,172
Gross Amount, offset	0	0
Net Amount	29,315	40,172
Gross Amount, not recognized	0	0
Gross amount, not offset	(1,525)	(13,021)
Net amount, after deduction	27,790	27,151
Interest Rate Swap [Member]
Gross amount, recognized	13,972	4,983
Gross Amount, offset	0	0
Net Amount	13,972	4,983
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	13,972	4,983
Payer Swaptions [Member]
Gross amount, recognized	14,849	33,398
Gross Amount, offset	0	0
Net Amount	14,849	33,398
Gross Amount, not recognized	0	0
Gross amount, not offset	(1,505)	(12,489)
Net amount, after deduction	13,344	20,909
Interest Rate Cap [Member]
Gross amount, recognized	474	1,119
Gross Amount, offset	0	0
Net Amount	474	1,119
Gross Amount, not recognized	0	0
Gross amount, not offset	0	0
Net amount, after deduction	474	1,119
TBA Contracts [Member]
Gross amount, recognized	20	672
Gross Amount, offset	0	0
Net Amount	20	672
Gross Amount, not recognized	0	0
Gross amount, not offset	(20)	(532)
Net amount, after deduction	$ 0	$ 140